DEPRECATION WARNING when using mongomapper-versioned and Sorcery

[nachbar]

I am using MongoMapper and Sorcery with no problems. However, when I include the mongomapper-versioned in my Gemfile, I get the following warning when I start rails with either 'rails server' or 'rails console' :

DEPRECATION WARNING: The InstanceMethods module inside ActiveSupport::Concern will be no longer included automatically. Please define instance methods directly in MongoMapper::Plugins::AutoIncrement instead. (called from <top (required)> at /Users/nachbar/work/2012/railstest/rm323/config/application.rb:13)

This is a barebones test application, created from scratch just for testing. The line referenced in application.rb is just the boilerplate created by the Rails application generation:

Bundler.require(*Rails.groups(:assets => %w(development test)))

In creating the application, I followed the instructions at http://mongomapper.com/documentation/getting-started/rails.html. Then, I added sorcery, by including in my Gemfile:

gem 'sorcery'
gem "bcrypt-ruby", :require => "bcrypt"

and running

bundle install
rails g sorcery:install

Now, I can test my setup:

rails console
User.new

which creates a user and returns the BSON ObjectId
Now, if I add

gem 'mongomapper-versioned'

to the Gemfile, and then

bundle install
rake versioned:create_indexes

I get the deprecation warning noted above (twice) after rake versioned:create_indexes. I get the same warnings any time I start rails with rails console or rails server. If I comment out the gem 'mongomapper-versioned' line in Gemfile, the warnings go away.